Space Marine Battle-barge
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A battle barge is a large capital ship employed by Space Marine fleets. With the exception of the mobile fortress-monasteries employed by some Chapters, they are the largest capital ships available to the Space Marines. A Chapter will generally have two or three, though some have more (e.g. the Ultramarines have five).
The term itself is more of a ship type than a specific pattern; the Adeptus Mechanicus does produce a special pattern of ship just for Space Marines, but any ship can be used as a battle barge so long as it has enough capacity to launch vast quantities of Thunderhawks and Drop Pods and enough weapons and armor to protect them.
No matter what they start as, or what they look like, battle barges (like all Space Marine starships) are specialized for planetary assault. They have relatively little long-range firepower, but instead have enough hangar and torpedo bay capacity to launch three full companies of Space Marines at once, perform an orbital bombardment, or even commit Exterminatus.
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